Well, all I have is my experience. Even when we had the 15 GB planI agree. This month I "squandered" data by installing and updating two computers to Linux Mint 17.3 and the Big One .... I brought my Galaxy Tab 4 home for a week and you just can't TAME all the apps on that thing. It is a comparative Data Hog and it show in my monthly usage to date.
Trained on the DW6000 here, too. When you start out with very little data and have to watch it like a hawk, you tend to do the same even when you have a lot more.
I'm actually on track this month to use the most data I've ever used in a month (I think)...about 6GB, combined.
I have six Blu -ray films.
I know that you stream using your TV, but your setup is a bit more complicated than what I would be using, so I have a question. If I use the Netflix app on my TV, I am able to adjust the streaming resolution under the account at Netflix, right? I'm thinking of trying the 30 day trial.